| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * This file contains NUMA specific variables and functions which can |
| 7 | * be split away from DISCONTIGMEM and are used on NUMA machines with |
| 8 | * contiguous memory. |
| 9 | * |
| 10 | * 2002/08/07 Erich Focht <efocht@ess.nec.de> |
| 11 | */ |
| 12 | |
| 13 | #include <linux/config.h> |
| 14 | #include <linux/cpu.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/mm.h> |
| 17 | #include <linux/node.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/bootmem.h> |
| 20 | #include <asm/mmzone.h> |
| 21 | #include <asm/numa.h> |
| 22 | |
| 23 | |
| 24 | /* |
| 25 | * The following structures are usually initialized by ACPI or |
| 26 | * similar mechanisms and describe the NUMA characteristics of the machine. |
| 27 | */ |
| 28 | int num_node_memblks; |
| 29 | struct node_memblk_s node_memblk[NR_NODE_MEMBLKS]; |
| 30 | struct node_cpuid_s node_cpuid[NR_CPUS]; |
| 31 | /* |
| 32 | * This is a matrix with "distances" between nodes, they should be |
| 33 | * proportional to the memory access latency ratios. |
| 34 | */ |
| 35 | u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES]; |
| 36 | |
| 37 | /* Identify which cnode a physical address resides on */ |
| 38 | int |
| 39 | paddr_to_nid(unsigned long paddr) |
| 40 | { |
| 41 | int i; |
| 42 | |
| 43 | for (i = 0; i < num_node_memblks; i++) |
| 44 | if (paddr >= node_memblk[i].start_paddr && |
| 45 | paddr < node_memblk[i].start_paddr + node_memblk[i].size) |
| 46 | break; |
| 47 | |
| 48 | return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0); |
| 49 | } |
| Bob Picco | 2d4b1fa | 2005-10-04 15:13:57 -0400 | [diff] [blame] | 50 | |
| 51 | #if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA) |
| 52 | /* |
| 53 | * Because of holes evaluate on section limits. |
| 54 | * If the section of memory exists, then return the node where the section |
| 55 | * resides. Otherwise return node 0 as the default. This is used by |
| 56 | * SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where |
| 57 | * the section resides. |
| 58 | */ |
| 59 | int early_pfn_to_nid(unsigned long pfn) |
| 60 | { |
| 61 | int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec; |
| 62 | |
| 63 | for (i = 0; i < num_node_memblks; i++) { |
| 64 | ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT; |
| 65 | esec = (node_memblk[i].start_paddr + node_memblk[i].size + |
| 66 | ((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT; |
| 67 | if (section >= ssec && section < esec) |
| 68 | return node_memblk[i].nid; |
| 69 | } |
| 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | #endif |